Statistical analysis
Continuous data were expressed as median and interquartile range (IQR) or mean and standard deviation (SD) and compared between groups using ANOVA. Qualitative variables were presented as percentages and compared between groups using Chi2 test or Fisher’s exact test.A univariate Cox model was performed to compare the occurrence of events in each group.
All tests were two-sided. A p-value < 0.5 was considered significant for all analysis.
R Studio statistical software (RStudio, Inc. 2019 version, 1.2.5001) was used.